this is a little late, but the files can be in a few different places depending on the revision of the game...... the best thing to do is look in the directory where the dmod is,,, and search each directory .. the newest version is rather self explanatory with map 1 and map 2 .... fb3, and lot where some other spots i noticed ...

In the version i have the files are now in a directory called map 1 and map 2 .... map 1 being empty until you copy in in there .